Word.ws English Dictionary

π Day

π Day is the alternative form of Pi Day.

Meaning of Pi Day

Proper noun

Pi Day

  1. March 14th, an annual celebration of the mathematical constant π (pi).
    • Did you know that March 14 is Pi Day (no, π is not misspelled). Pi Day is celebrated on 3/14 or 3.14! To commemorate this remarkable ratio, we have a few circular activities. The first is the Pizza Survey. What are the students' favorite toppings on pizza? What do you like best?1997, Louise Bock, Susan Guengerich, Hope Martin, “March Celebrations”, in Multicultural Math Fun: Holidays around the Year, Portland, Me.: J. Weston Walch Publisher, →ISBN, page 83

Questions about π Day

What is π Day the alternative form of?
Π Day is the alternative form of Pi Day.

Words near π Day in the dictionary

  1. μseconds
  2. μwave
  3. μwaves
  4. π bond
  5. π bonds
  6. π Day
  7. π-mer
  8. π-mers
  9. π-on
  10. π-system
  11. π-systems

Source and license

Adapted from Wiktionary: π Day (page history and authors); Pi Day (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Pronunciation audio from Wikimedia Commons, each file under its own free license: LL-Q1860 (eng)-Flame, not lame-π Day.wav.

Cite this entry: “π Day.” Word.ws, https://word.ws/%CF%80_day. Based on Wiktionary, CC BY-SA 4.0.